B65D 51/223

Caps, lids, or covers co-operating with an inner closure arranged to be opened by piercing, cutting, or tearing having means for piercing, cutting, or tearing the inner closure {a major part of the inner closure being left inside the container after the opening the piercing or cutting means being integral with, or fixedly attached to, the outer closure the outer closure having to be removed or inverted for piercing or cutting}